David Carrillo writes for San Francisco Chronicle, March 11, 2017
There is only one narrow path to secession: amending the U.S. Constitution, which requires approval by two-thirds of Congress and 38 of the states. This is a high bar — it has only happened 17 times in 226 years. Calexit does nothing to start that process. And even if that overwhelming consensus could be achieved here, it would be disastrous.